Diamond Port Plug

A diamond port plug has a diamond-shaped port by the plug. This design is for throttling service. All diamond port valves are venturi restricted flow categories.

Round Port Plug

Round port plug is a term which elaborates a valve which has a round opening by the plug. It is referred to as a full port if the port is the same size or larger than the pipe's inside diameter. A port is referred to as a standard round port if the opening is smaller than the pipe's inside diameter. Valves having standard round ports are used only whereas restriction of flow is unimportant.